This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...experiments, detailed in previous chapters, made by means of the hues emerging from slits placed in the focussed spectrum can be also made by apparatus much less complicated and expensive. In the actual production of the positive in colours by synthetical methods, the pure colours (spectrum colours) are not easily ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...experiments, detailed in previous chapters, made by means of the hues emerging from slits placed in the focussed spectrum can be also made by apparatus much less complicated and expensive. In the actual production of the positive in colours by synthetical methods, the pure colours (spectrum colours) are not easily obtainable, and, in their stead, a near approach, in the light coming through coloured glasses, is used. Coloured glasses are chosen which pass rays approximating to the narrow bands in the spectrum which they respectively represent. Such is the method adopted by Mr. Ives in the Kromskop and' projection lantern. To secure the combination of the colours a great many devices are available, requiring more or less apparatus; the following is as simple as any. All that are required are an even flame of large dimensions such as is given by a Welsbach incandescent mantle, a lens of, say, three inches diameter, and the pieces of glass--red, green and blue-violet. These are laid in a line, on a piece of cardboard, which has holes cut out to allow three beams to pass through. The lens is fixed against an aperture in a box, which should be blackened inside, and the image of the mantle is received on a small white surface inside the box. Focus the mantle, and insert the glasses on their cardboard against the lens, and if the three apertures are correctly adjusted in size a white image is obtained. By covering up the apertures, singly, and in parts, the six main divisions of colour can be shown. Graduated wedges made on dry plates can be used to produce intermediate tints. This experiment requires so little apparatus, only a uniform light and a common lens such as a reading magnifier, that anyone can perform it. Pieces of glass of representative colours can be...
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